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add libsndifle 1.0.17 to in tree libs
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3761 d0543943-73ff-0310-b7d9-9358b9ac24b2
This commit is contained in:
Michael Jerris
262
libs/libsndfile/src/float_cast.h
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262
libs/libsndfile/src/float_cast.h
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/*
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** Copyright (C) 2001-2004 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU Lesser General Public License as published by
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** the Free Software Foundation; either version 2.1 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU Lesser General Public License for more details.
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**
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** You should have received a copy of the GNU Lesser General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* Version 1.4 */
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#ifndef FLOAT_CAST_HEADER
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#define FLOAT_CAST_HEADER
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/*============================================================================
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** On Intel Pentium processors (especially PIII and probably P4), converting
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** from float to int is very slow. To meet the C specs, the code produced by
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** most C compilers targeting Pentium needs to change the FPU rounding mode
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** before the float to int conversion is performed.
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**
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** Changing the FPU rounding mode causes the FPU pipeline to be flushed. It
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** is this flushing of the pipeline which is so slow.
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**
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** Fortunately the ISO C99 specifications define the functions lrint, lrintf,
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** llrint and llrintf which fix this problem as a side effect.
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**
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** On Unix-like systems, the configure process should have detected the
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** presence of these functions. If they weren't found we have to replace them
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** here with a standard C cast.
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*/
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/*
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** The C99 prototypes for lrint and lrintf are as follows:
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**
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** long int lrintf (float x) ;
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** long int lrint (double x) ;
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*/
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#include "sfconfig.h"
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/*
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** The presence of the required functions are detected during the configure
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** process and the values HAVE_LRINT and HAVE_LRINTF are set accordingly in
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** the sfconfig.h file.
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*/
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#define HAVE_LRINT_REPLACEMENT 0
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#if (HAVE_LRINT && HAVE_LRINTF)
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/*
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** These defines enable functionality introduced with the 1999 ISO C
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** standard. They must be defined before the inclusion of math.h to
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** engage them. If optimisation is enabled, these functions will be
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** inlined. With optimisation switched off, you have to link in the
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** maths library using -lm.
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*/
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#define _ISOC9X_SOURCE 1
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#define _ISOC99_SOURCE 1
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#define __USE_ISOC9X 1
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#define __USE_ISOC99 1
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#include <math.h>
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#elif (defined (__CYGWIN__))
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#include <math.h>
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#undef HAVE_LRINT_REPLACEMENT
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#define HAVE_LRINT_REPLACEMENT 1
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#undef lrint
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#undef lrintf
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#define lrint double2int
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#define lrintf float2int
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/*
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** The native CYGWIN lrint and lrintf functions are buggy:
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** http://sourceware.org/ml/cygwin/2005-06/msg00153.html
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** http://sourceware.org/ml/cygwin/2005-09/msg00047.html
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** and slow.
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** These functions (pulled from the Public Domain MinGW math.h header)
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** replace the native versions.
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*/
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static inline long double2int (double in)
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{ long retval ;
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__asm__ __volatile__
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( "fistpl %0"
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: "=m" (retval)
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: "t" (in)
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: "st"
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) ;
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return retval ;
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} /* double2int */
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static inline long float2int (float in)
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{ long retval ;
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__asm__ __volatile__
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( "fistpl %0"
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: "=m" (retval)
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: "t" (in)
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: "st"
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) ;
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return retval ;
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} /* float2int */
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#elif (defined (WIN32) || defined (_WIN32))
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#undef HAVE_LRINT_REPLACEMENT
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#define HAVE_LRINT_REPLACEMENT 1
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#include <math.h>
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/*
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** Win32 doesn't seem to have these functions.
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** Therefore implement inline versions of these functions here.
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*/
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__inline long int
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lrint (double flt)
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{ int intgr ;
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_asm
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{ fld flt
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fistp intgr
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} ;
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return intgr ;
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}
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__inline long int
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lrintf (float flt)
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{ int intgr ;
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_asm
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{ fld flt
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fistp intgr
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} ;
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return intgr ;
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}
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#elif (defined (__MWERKS__) && defined (macintosh))
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/* This MacOS 9 solution was provided by Stephane Letz */
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#undef HAVE_LRINT_REPLACEMENT
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#define HAVE_LRINT_REPLACEMENT 1
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#include <math.h>
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#undef lrint
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#undef lrintf
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#define lrint double2int
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#define lrintf float2int
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inline int
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float2int (register float in)
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{ long res [2] ;
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asm
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{ fctiw in, in
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stfd in, res
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}
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return res [1] ;
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} /* float2int */
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inline int
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double2int (register double in)
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{ long res [2] ;
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asm
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{ fctiw in, in
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stfd in, res
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}
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return res [1] ;
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} /* double2int */
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#elif (defined (__MACH__) && defined (__APPLE__))
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/* For Apple MacOSX. */
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#undef HAVE_LRINT_REPLACEMENT
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#define HAVE_LRINT_REPLACEMENT 1
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#include <math.h>
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#undef lrint
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#undef lrintf
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#define lrint double2int
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#define lrintf float2int
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inline static long
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float2int (register float in)
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{ int res [2] ;
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__asm__ __volatile__
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( "fctiw %1, %1\n\t"
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"stfd %1, %0"
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: "=m" (res) /* Output */
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: "f" (in) /* Input */
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: "memory"
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) ;
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return res [1] ;
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} /* lrintf */
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inline static long
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double2int (register double in)
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{ int res [2] ;
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__asm__ __volatile__
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( "fctiw %1, %1\n\t"
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"stfd %1, %0"
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: "=m" (res) /* Output */
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: "f" (in) /* Input */
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: "memory"
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) ;
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return res [1] ;
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} /* lrint */
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#else
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#ifndef __sgi
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#warning "Don't have the functions lrint() and lrintf()."
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#warning "Replacing these functions with a standard C cast."
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#endif
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#include <math.h>
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#define lrint(dbl) ((long) (dbl))
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#define lrintf(flt) ((long) (flt))
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#endif
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#endif /* FLOAT_CAST_HEADER */
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/*
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** Do not edit or modify anything in this comment block.
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** The arch-tag line is a file identity tag for the GNU Arch
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** revision control system.
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**
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** arch-tag: 42db1693-ff61-4051-bac1-e4d24c4e30b7
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*/
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